President Barack Obama signs the 21st Century Cures Act, Tuesday, Dec. 13, 2016, in the South Court Auditorium in the Eisenhower Executive Office Building on the White House complex in Washington. (AP Photo/Pablo Martinez Monsivais)

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WASHINGTON (AP) — On a “bittersweet day” that brought back memories of loved ones lost, President Barack Obama signed into law legislation that makes new investments in cancer research and battling drug abuse.

Obama signed the bill Tuesday at a ceremony on the White House campus flanked by Vice President Joe Biden and key lawmakers. The 55-year-old president recounted that his own mother did not even reach his age, dying of cancer in her early 50s.

“It’s not always easy to remember, but being able to honor those we’ve lost in this way and to know that we may be able to prevent other families from feeling that same loss, that makes it a good day,” Obama said. “It’s a good day to see us doing our jobs.”

The 21st Century Cures Act invests $1.8 billion for a cancer research “moonshot” that is strongly supported by Biden. The vice president’s son, Beau, died of brain cancer in 2015.

The bill also authorizes giving states $1 billion over two years to prevent and treat the abuse of opioids and other addictive drugs like heroin.

Overall, the measure plans $6.3 billion in new spending over the coming decade. The bill also streamlines the approval process for drugs and medical devices at the Food and Drug Administration.

The legislation was created by U.S. Rep. Fred Upton, R-St.Joseph, in a bipartisan effort with fellow Energy and Commerce Committee member Rep. Diana DeGette, D-Colorado.

Biden said he believed the bill would inject new urgency into fighting cancer and would give millions of Americans hope that they will be able to have their lives extended through research that will bring about new cures and treatments.

“Every day, millions of people are praying, praying for hope, praying for time,” Biden said.